Variation of power generation at different buffer types and conductivities in single chamber microbial fuel cells

Handle URI:
http://hdl.handle.net/10754/600162
Title:
Variation of power generation at different buffer types and conductivities in single chamber microbial fuel cells
Authors:
Nam, Joo-Youn; Kim, Hyun-Woo; Lim, Kyeong-Ho; Shin, Hang-Sik; Logan, Bruce E.
Abstract:
Microbial fuel cells (MFCs) are operated with solutions containing various chemical species required for the growth of electrochemically active microorganisms including nutrients and vitamins, substrates, and chemical buffers. Many different buffers are used in laboratory media, but the effects of these buffers and their inherent electrolyte conductivities have not been examined relative to current generation in MFCs. We investigated the effect of several common buffers (phosphate, MES, HEPES, and PIPES) on power production in single chambered MFCs compared to a non-buffered control. At the same concentrations the buffers produced different solution conductivities which resulted in different ohmic resistances and power densities. Increasing the solution conductivities to the same values using NaCl produced comparable power densities for all buffers. Very large increases in conductivity resulted in a rapid voltage drop at high current densities. Our results suggest that solution conductivity at a specific pH for each buffer is more important in MFC studies than the buffer itself given relatively constant pH conditions. Based on our analysis of internal resistance and a set neutral pH, phosphate and PIPES are the most useful buffers of those examined here because pH was maintained close to the pKa of the buffer, maximizing the ability of the buffer to contribute to increase current generation at high power densities. © 2009 Elsevier B.V. All rights reserved.
Citation:
Nam J-Y, Kim H-W, Lim K-H, Shin H-S, Logan BE (2010) Variation of power generation at different buffer types and conductivities in single chamber microbial fuel cells. Biosensors and Bioelectronics 25: 1155–1159. Available: http://dx.doi.org/10.1016/j.bios.2009.10.005.
Publisher:
Elsevier BV
Journal:
Biosensors and Bioelectronics
KAUST Grant Number:
KUS-11-003-13
Issue Date:
15-Jan-2010
DOI:
10.1016/j.bios.2009.10.005
PubMed ID:
19896357
Type:
Article
ISSN:
0956-5663
Sponsors:
This research was supported by the National Science Foundation grants CBET-0730359, Award KUS-11-003-13 by King Abdullah University of Science and Technology (KAUST), and by Brain Korea 21 project in 2008.
Appears in Collections:
Publications Acknowledging KAUST Support

Full metadata record

DC FieldValue Language
dc.contributor.authorNam, Joo-Younen
dc.contributor.authorKim, Hyun-Wooen
dc.contributor.authorLim, Kyeong-Hoen
dc.contributor.authorShin, Hang-Siken
dc.contributor.authorLogan, Bruce E.en
dc.date.accessioned2016-02-28T06:44:03Zen
dc.date.available2016-02-28T06:44:03Zen
dc.date.issued2010-01-15en
dc.identifier.citationNam J-Y, Kim H-W, Lim K-H, Shin H-S, Logan BE (2010) Variation of power generation at different buffer types and conductivities in single chamber microbial fuel cells. Biosensors and Bioelectronics 25: 1155–1159. Available: http://dx.doi.org/10.1016/j.bios.2009.10.005.en
dc.identifier.issn0956-5663en
dc.identifier.pmid19896357en
dc.identifier.doi10.1016/j.bios.2009.10.005en
dc.identifier.urihttp://hdl.handle.net/10754/600162en
dc.description.abstractMicrobial fuel cells (MFCs) are operated with solutions containing various chemical species required for the growth of electrochemically active microorganisms including nutrients and vitamins, substrates, and chemical buffers. Many different buffers are used in laboratory media, but the effects of these buffers and their inherent electrolyte conductivities have not been examined relative to current generation in MFCs. We investigated the effect of several common buffers (phosphate, MES, HEPES, and PIPES) on power production in single chambered MFCs compared to a non-buffered control. At the same concentrations the buffers produced different solution conductivities which resulted in different ohmic resistances and power densities. Increasing the solution conductivities to the same values using NaCl produced comparable power densities for all buffers. Very large increases in conductivity resulted in a rapid voltage drop at high current densities. Our results suggest that solution conductivity at a specific pH for each buffer is more important in MFC studies than the buffer itself given relatively constant pH conditions. Based on our analysis of internal resistance and a set neutral pH, phosphate and PIPES are the most useful buffers of those examined here because pH was maintained close to the pKa of the buffer, maximizing the ability of the buffer to contribute to increase current generation at high power densities. © 2009 Elsevier B.V. All rights reserved.en
dc.description.sponsorshipThis research was supported by the National Science Foundation grants CBET-0730359, Award KUS-11-003-13 by King Abdullah University of Science and Technology (KAUST), and by Brain Korea 21 project in 2008.en
dc.publisherElsevier BVen
dc.subjectBuffer typeen
dc.subjectConductivityen
dc.subjectImpedance measurementen
dc.subjectSingle chamber microbial fuel cellen
dc.titleVariation of power generation at different buffer types and conductivities in single chamber microbial fuel cellsen
dc.typeArticleen
dc.identifier.journalBiosensors and Bioelectronicsen
dc.contributor.institutionKorea Advanced Institute of Science & Technology, Yusong, South Koreaen
dc.contributor.institutionArizona State University, Tempe, United Statesen
dc.contributor.institutionKongju National University, Gongju-si, South Koreaen
dc.contributor.institutionPennsylvania State University, State College, United Statesen
kaust.grant.numberKUS-11-003-13en

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